sched: Switch wait_task_inactive to schedule_hrtimeout()

When we force thread hard and soft interrupts the startup of ksoftirqd
would hang in kthread_bind() when wait_task_inactive() calls
schedule_timeout_uninterruptible() because there is no softirq yet
which will wake us up.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.677109139@linutronix.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 18d38e4ec7ba..66ca5d9ba83c 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2224,7 +2224,10 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
                  * yield - it could be a while.
                  */
                 if (unlikely(on_rq)) {
-                        schedule_timeout_uninterruptible(1);
+                        ktime_t to = ktime_set(0, NSEC_PER_SEC/HZ);
+
+                        set_current_state(TASK_UNINTERRUPTIBLE);
+                        schedule_hrtimeout(&to, HRTIMER_MODE_REL);
                         continue;
                 }